KR20080026914A - A condenser having multiple gas-liquid separators - Google Patents

Abstract

A condenser with a multiple type gas-liquid separator is provided to form a gas-liquid separator in a multi-stepped structure for using most of the condenser parts as supercooling areas in the case of a low load and keeping the supercooling areas in the case of a high load, thereby increasing cooling efficiency. A condenser includes a multiple type gas-liquid separator(100) mounted at a side of a pair of parallel header tanks(210) for separating liquid and gas refrigerant from each other. The gas-liquid separator is divided into first and second separator parts(110,120). The first separator part is connected to an inlet(211) of the header tanks via a refrigerant path serving as a first heat exchange area(A1) and connected to an outlet(212) of the header tanks and an inlet of the second separator part by a refrigerant path serving as a second heat exchange area(A2). An outlet of the second separator part is connected to the outlet of the header tanks by a refrigerant path serving as a third heat exchange area(A3). Baffles(213) define a plurality of spaces in the header tanks.

Description

A condenser having multiple gas-liquid separators

1 is a refrigerant flow diagram of a condenser according to the prior art.

2 is a front view of the condenser according to the present invention;

3 is a refrigerant flow diagram of the condenser according to the present invention.

4a and 4b are P-h diagrams and heat exchange zones of the condenser according to the prior art and the invention at low loads.

5 is a heat exchange region of the condenser according to the prior art and the present invention at high load.

6 is a front view of another embodiment of a condenser according to the present invention.

7 is a P-h diagram of each of the low load and high load in the condenser according to the embodiment of FIG.

** Description of the symbols for the main parts of the drawings **

100: gas-liquid separator

110: primary gas-liquid separator 120: secondary gas-liquid separator

131: gas-liquid separator inlet 132: gas-liquid separator outlet

200: condenser

210: tank 211: inlet

212: outlet 213: baffle

The present invention relates to a condenser having multiple gas-liquid separators.

A heat exchanger is a device that absorbs heat from one side and releases heat to the other between two environments with a difference in temperature. In this case it will act as a heating system. Basically, a heat exchanger is an evaporator that absorbs heat from the environment, a compressor that compresses refrigerant or fruit, a condenser that releases heat to the environment, and a turbine that expands the refrigerant or fruit ( Or expansion valve). In the cooling device, the actual cooling action is caused by an evaporator in which the liquid refrigerant absorbs the amount of heat as vaporized heat from the surroundings and vaporizes. The gaseous refrigerant flowing from the evaporator into the compressor is compressed at a high temperature and high pressure in the compressor, and liquefied heat is released to the surroundings in the process of liquefying the compressed gaseous refrigerant through the condenser, and the liquefied refrigerant is again By passing through the turbine (or expansion valve) is a low-temperature and low-pressure wetted vapor state and then flows back into the evaporator to vaporize to form a cycle.

As described above, in the condenser, a refrigerant having a high temperature and high pressure gas flows in and condenses into a liquid state while releasing liquefied heat by heat exchange. Thus, the refrigerant is in a process of changing from a gaseous phase to a liquid phase. The refrigerant and the liquid refrigerant are mixed. However, when the gaseous refrigerant and the liquid phase refrigerant are mixed, only equilibrium conditions can be obtained in temperature and pressure. Therefore, in order to increase the condenser efficiency, it is desirable to separate the liquid phase refrigerant that has already been condensed and the gaseous phase refrigerant that has not yet condensed. Do. Therefore, gas-liquid separators of various structures that are provided in the condenser to separate the gaseous refrigerant and the liquid refrigerant have been proposed.

In Japanese Patent Laid-Open No. 1999-142023 (hereinafter, referred to as a prior art), a refrigerant is gas-liquid separated, and a gaseous refrigerant is sent to the upper end, and a liquid refrigerant is sent to the lower end. It is. 1 shows a refrigerant flow in a condenser with a gas-liquid separator according to the prior art. The gaseous refrigerant compressed by high temperature and high pressure by the compressor flows into the inlet 21 of the one side header tank 20, and flows along ① in the P1 region by the baffle 23 provided in the header tank 20. I will go. Condensation has already occurred in this process, and thus the refrigerant flowing into the other header tank 20 is in a state where the gas phase and the liquid phase are already mixed. The other header tank 20 is also partitioned by the baffle 23, the refrigerant is separated into the gas phase and liquid phase. Among the refrigerants in the mixed state introduced into the section of the header tank 20 partitioned by the baffle 23, the gaseous refrigerant not only has high molecular motion but also moves upward due to the difference in density from the liquid refrigerant, and the liquid refrigerant is in the gas phase. It is relatively viscous and has a high mass and density compared to the refrigerant, so it moves in the direction of gravity, that is, downward. That is, in the direction of ②, the refrigerant containing more gas phase flows, so that most of the P2 region has a gas phase refrigerant. In the direction of ②, the refrigerant containing more liquid phase flows, so that most of the liquid refrigerant exists in the P5 region. do. The refrigerant flowing into the P2 region flows in the direction of ③ through the P3 region, and recondensation occurs. The refrigerant, which becomes liquid by condensation, is collected in the gas-liquid separator 10 along the ④. The refrigerant flowing into the P5 region flows in the direction ③ 'through the P6 region, and recondensation occurs, and is also collected in the gas-liquid separator 10 along ④'. In the end, the gas-liquid separator 10 collects a refrigerant having a large amount of liquid, and the liquid refrigerant flows along ⑤, thereby subcooling. That is, the condenser according to the prior art is divided into a condensing area consisting of P1, P2, P3, P5, and P6 and a subcooling area consisting of P4. As a result, the enthalpy of the refrigerant is generated by the subcooling. It can be lowered further to increase the cooling efficiency.

However, in view of the current technical trend of gradually reducing the weight, compactness, and high performance of in-vehicle components, the conventional gas-liquid separation method does not provide sufficient cooling efficiency in the condenser, thereby increasing cooling efficiency. There has been a demand for a solution.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to provide a condenser having a multiple gas-liquid separator to increase the cooling efficiency by widening the supercooling area by configuring a multiple gas-liquid separator. Is in.

Condenser having a multiple gas-liquid separator of the present invention for achieving the above object, a pair of parallel header tank (210); Tubes 220 arranged between the header tanks 210; A heat dissipation fin 230 interposed between the tubes 220; An inlet port 211 provided in the header tank 210 and a refrigerant inlet port 211 and a refrigerant outlet port 212; A baffle 213 provided inside the header tank 210 to partition an inner space of the header tank 210; In the condenser 1000 provided on one side of the header tank 210 and including a gas-liquid separator 100 for separating a gaseous refrigerant and a liquid refrigerant, the gas-liquid separator 100 is applied to a load applied to the condenser 1000. It is characterized in that it is multiple to vary the number of gas-liquid separation according. At this time, the gas-liquid separator 100 is characterized in that divided into the primary gas-liquid separator 110 and the secondary gas-liquid separator 120. In this case, the condenser 1000 may include a first heat exchange area A1 consisting of a refrigerant flow path from the inlet 211 to the inlet of the first gas liquid separator 110 and the second gas liquid separator from the outlet of the first gas liquid separator 110. (120) characterized in that it is divided into a secondary heat exchange region (A2) consisting of a refrigerant passage to the inlet and a third heat exchange region (A3) consisting of a refrigerant passage from the outlet of the secondary gas-liquid separator (120) to the outlet (212). do.

In addition, the gas-liquid separator 100 is integral and is divided into multiple compartments by the baffle (213).

In addition, the at least one gas-liquid separator outlet 132 is characterized in that the decompression means is further provided. At this time, the decompression means is formed by making the flow passage cross-sectional area of the gas-liquid separator outlet 132 smaller than the flow-path cross-sectional area of the gas-liquid separator inlet 131.

Hereinafter, with reference to the accompanying drawings a condenser having a multiple gas-liquid separator according to the present invention having the configuration as described above will be described in detail.

2 is a front view of the condenser according to the present invention. The condenser 1000 according to the present invention includes a pair of parallel header tanks 210; Tubes 220 arranged between the header tanks 210; A heat dissipation fin 230 interposed between the tubes 220; An inlet port 211 provided in the header tank 210 and a refrigerant inlet port 211 and a refrigerant outlet port 212; A baffle 213 provided inside the header tank 210 to partition an inner space of the header tank 210; And a gas-liquid separator 100 formed in multiple forms on one side of the header tank 210 to separate the gaseous refrigerant and the liquid refrigerant. Gas-liquid separator 100 in the present invention can increase the cooling efficiency by being configured in multiple, unlike the prior art.

3 shows the refrigerant flow in the condenser according to the invention. First, the high temperature and high pressure gaseous refrigerant flows into the primary heat exchange region A1 of the condenser 1000 through the inlet 211. As shown, the inner space of the header tank 210 is partitioned by the baffle 213 to induce the flow direction of the refrigerant, and the refrigerant flows through the primary heat exchange region A1 to cause condensation. The high-temperature, high-pressure gaseous refrigerant is condensed through the condensation process, and the gaseous phase and the liquid phase are mixed, and the gaseous refrigerant is introduced into the primary gas-liquid separator 110. Since the liquid refrigerant has a relatively high viscosity and a high mass and density compared to the gaseous refrigerant, the liquid refrigerant is greatly influenced by gravity and is collected under the primary gas-liquid separator 110. At this time, the lower portion of the primary gas-liquid separator 110 is connected to the header tank 210, so that the collected liquid refrigerant flows into the secondary heat exchange region A2. The refrigerant present in the secondary heat exchange area A2 is mostly liquid, but may not be completely condensed, and thus some of the gaseous phase may be mixed. In the secondary heat exchange zone (A2), recondensation occurs when there are a lot of gaseous refrigerants, and if a sufficient amount of liquid refrigerant is formed due to sufficient condensation, supercooling occurs. The refrigerant is introduced into the secondary gas-liquid separator 120 to be recondensed. Perform the liquid separation. The refrigerant collected in the lower portion of the secondary gas-liquid separator 120 through two gas-liquid separation processes is finally passed through the tertiary heat exchange region A3. The refrigerant present in the tertiary heat exchange region A3 is almost completely liquid. At this time, supercooling is performed.

4A and 4B are P-h diagrams of the condenser according to the prior art and the condenser according to the present invention, respectively, at low load. In Figure 4a (A) is a condenser without a gas-liquid separator according to the prior art, (B) shows a Ph diagram in a condenser having a gas-liquid separator according to the prior art, Figure 4b is a multi-gas liquid according to the present invention Ph diagram in a condenser with separator is shown.

When the condenser is low load, it refers to an environment in which a large amount of air to the condenser or a low temperature inside and outside the vehicle, that is, the refrigerant can easily reach the liquid phase. As such, when the load is low, a condenser without a gas-liquid separator shows a P-h diagram as shown in FIG. 4A (A), thereby obtaining basic cooling efficiency. In the P-h diagram, the cooling efficiency can be easily determined by how large the enthalpy difference can be obtained in one cooling cycle, and the larger the enthalpy difference, the higher the cooling efficiency. Since the condenser having a gas-liquid separator according to the prior art performs supercooling after condensation, it can be seen in the P-h diagram shown in FIG. 4A that the cooling efficiency is increased by the difference in enthalpy generated in the supercooling region. However, the condenser provided with the multiple gas-liquid separator according to the present invention, all the condensation process takes place in the primary heat exchange zone, the liquid refrigerant is introduced into the primary gas-liquid separator, the supercooling occurs in the secondary heat exchange zone, and again the secondary gas liquid The refrigerant passing through the separator is once again supercooled in the tertiary heat exchange zone. Therefore, as shown in Figure 4b, it is possible to obtain a much larger enthalpy difference than in the condenser having a gas-liquid separator according to the prior art, that is, it can be seen that the cooling efficiency is much superior.

Figure 5 shows the heat exchange area of each condenser at high load, the condenser with a gas-liquid separator according to the prior art is shown in Figure 5 (A), the condenser with a gas-liquid separator according to the present invention is shown in Figure (B) Is shown. At high load, the condenser according to the present invention condenses in the primary heat exchange zone and the secondary heat exchange zone, and supercooling occurs in the tertiary heat exchange zone, as shown in FIG. 5 (B). Therefore, the area where the condensation takes place in the condenser according to the present invention at high load / the area where the supercooling takes place is the same as the area where the condensation occurs in the condenser according to the prior art / the area where the subcooling takes place. As described in the description of FIG. 4, in the condenser according to the present invention at low load, condensation is performed in the primary heat exchange zone, and supercooling is performed in the secondary heat exchange zone and the tertiary heat exchange zone. That is, the condenser equipped with the gas-liquid separator according to the present invention shows the same performance as the conventional one at high load and much better at low load, and as a result, the overall condenser performance is improved. .

6 is a front view of another embodiment of a condenser according to the present invention. The refrigerant is introduced into the gas-liquid separator inlet 131 from the tank 210 of the condenser 200, and the refrigerant is discharged into the tank 210 of the condenser 200 through the gas-liquid separator outlet 132. At this time, in another embodiment of the condenser according to the present invention, the gas-liquid separator outlet 132 is provided with a decompression means. In this embodiment, the pressure reducing means is formed by making the flow passage cross-sectional area of the gas-liquid separator outlet 132 smaller than the gas-liquid separator inlet 131 flow-path cross-sectional area, and of course, any type of pressure-reducing means is provided within the scope of the present invention. You may. In this embodiment, the pressure reducing means is formed at the gas-liquid separator outlet 132 of the primary gas-liquid separator 110, but of course, the pressure-reducing means is formed at the gas-liquid separator outlet of the secondary gas-liquid separator 120, or 1 The pressure reducing means may be formed at the outlets of both the gas-liquid separator and the secondary gas-liquid separator.

FIG. 7 illustrates P-h diagrams at the time of low load and high load when the pressure reducing means is further provided. As shown in the figure, when the gas-liquid separator outlet 132 is further provided with a decompression means, at low load, the liquid refrigerant is first reduced in pressure to move to two phases to further improve heat transfer efficiency, and further, by using a secondary gas-liquid separator. It is possible to maximize performance by subcooling only by separating the liquid phase, wherein the Ph diagram is shown as shown in Figure 7 (A). In addition, at high loads, even if a liquid phase does not occur, it is possible to further improve the heat exchange performance of the condenser by increasing the dryness through decompression.

The present invention is not limited to the above-described embodiments, and the scope of application of the present invention is not limited to those of ordinary skill in the art to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Of course, various modifications can be made.

As described above, according to the present invention, by configuring the gas-liquid separator in multiple stages, most of the condenser can be utilized as a subcooling region at low load, and the subcooling region can be maintained even at high load. In other words, by ensuring a subcooling area at least a certain area as described above there is an effect that can increase the cooling efficiency much more than the conventional condenser. In addition, it is also possible to produce a more compact condenser by increasing the cooling efficiency of the condenser.

Claims (6)

A pair of parallel header tanks 210; Tubes 220 arranged between the header tanks 210; A heat dissipation fin 230 interposed between the tubes 220; An inlet port 211 provided in the header tank 210 and a refrigerant inlet port 211 and a refrigerant outlet port 212; A baffle 213 provided inside the header tank 210 to partition an inner space of the header tank 210; In the condenser 1000 provided on one side of the header tank 210 and comprises a gas-liquid separator 100 for separating a gaseous refrigerant and a liquid refrigerant, The gas-liquid separator (100) is a condenser having a multiple gas-liquid separator, characterized in that the number of the gas-liquid separation is different depending on the load on the condenser (1000). According to claim 1, wherein the gas-liquid separator 100 Condenser with multiple gas-liquid separator, characterized in that divided into the primary gas-liquid separator (110) and the secondary gas-liquid separator (120). The method of claim 2, wherein the condenser 1000 Primary heat exchange region A1 consisting of a refrigerant passage from the inlet 211 to the inlet of the primary gas-liquid separator 110, A secondary heat exchange region A2 consisting of a refrigerant passage from the outlet of the primary gas-liquid separator 110 to the inlet of the secondary gas-liquid separator 120, and A condenser having multiple gas-liquid separators, characterized in that it is divided into a tertiary heat exchange zone (A3) consisting of a refrigerant flow path from the outlet of the secondary gas-liquid separator (120) to the outlet (212). According to any one of claims 1 to 3, wherein the gas-liquid separator 100 A condenser having a multiple gas-liquid separator, characterized in that it is integrated and divided into multiple compartments by a baffle (213). The method of claim 4, wherein At least one gas-liquid separator condenser having a multiple gas-liquid separator, characterized in that the pressure reducing means is further provided. The method of claim 5, wherein the decompression means A condenser having multiple gas-liquid separators, which is formed by making the flow passage cross-sectional area of the gas-liquid separator outlet 132 smaller than the flow-path cross-sectional area of the gas-liquid separator inlet 131.

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